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首页> 外文期刊>IEEE Transactions on Electromagnetic Compatibility >Predicting the Radiated Emissions of Automotive Systems According to CISPR 25 Using Current Scan Methods
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Predicting the Radiated Emissions of Automotive Systems According to CISPR 25 Using Current Scan Methods

机译：使用电流扫描方法根据CISPR 25预测汽车系统的辐射排放

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摘要

According to automotive standard CISPR 25, electronic components or modules are required to be connected to a specific test cable bundle in order to evaluate the radiated emissions. In the absorber-lined shielded enclosure (ALSE) method, also called the antenna method, the cable bundle is often the dominant radiation structure due to its length. This measurement method requires a large anechoic chamber, but often, it is only the impact of the test cable bundle's common-mode (CM) current distribution that is measured. Since the current distribution can be measured easily with current clamps, and with much lower demands to the environment, it is advantageous that the level of radiated fields can be estimated from the measured current distribution. This paper presents a field prediction method, which combines a measured CM current distribution with numerical computations for the radiated fields in the frequency range of 30–1000 MHz. Applicability is discussed based on several complex test cases. Three major problems had to be solved. First, appropriate current phase measurement methods had to be developed since the current amplitudes are not sufficient for estimating the electric fields. Second, a CM radiation model of a cable bundle had to be found. Third, in order to get comparable data for the ALSE test environment, a method had to be developed that could take this influence into account. Different solution approaches are examined here for the problems mentioned above.
机译：根据汽车标准CISPR 25，需要将电子组件或模块连接到特定的测试电缆束，以便评估辐射发射。在衬有吸收器的屏蔽罩（ALSE）方法（也称为天线方法）中，由于其长度，电缆束通常是主要的辐射结构。这种测量方法需要一个大的消声室，但是通常，仅测量测试电缆束的共模（CM）电流分布的影响。由于可以用电流钳容易地测量电流分布，并且对环境的要求低得多，因此有利的是，可以根据测量的电流分布来估计辐射场的水平。本文提出了一种场预测方法，该方法将测得的CM电流分布与数值计算相结合，用于30-1000 MHz频率范围内的辐射场。基于几个复杂的测试案例讨论了适用性。必须解决三个主要问题。首先，由于电流幅度不足以估计电场，因此必须开发适当的电流相位测量方法。其次，必须找到电缆束的CM辐射模型。第三，为了获得ALSE测试环境的可比数据，必须开发一种可以考虑这种影响的方法。这里针对上述问题研究了不同的解决方案。

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